>>> [chr(i) for i in range(256) if chr(i).isalpha()]
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
>>> Letras
<class __main__.Letras at 0xb7e8b89c>
>>> for letra in [chr(i) for i in range(256) if chr(i).isalpha()]:
...    setattr(Letras,letra)
... 
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
TypeError: setattr expected 3 arguments, got 2
>>> for letra in [chr(i) for i in range(256) if chr(i).isalpha()]:
...    setattr(Letras,letra,ord(letra))
... 
>>> Letra.A
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'Letra' is not defined
>>> Letras.A
65
>>> Letras.z
122
>>> for letra in [chr(i) for i in range(256) if chr(i).isalpha()]:
...    if letra not in 'aeiou' and hasattr(Letras,letra):
...        delattr(Letras, letra)
... 
>>> Letras.b
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: class Letras has no attribute 'b'
>>> Letras.a
97
>>> Letras.e
101
>
